Check all power cable terminations at both the drive output terminals and the motor terminal box for tightness.
is a protective response to either genuine motor overheating or a faulty temperature sensing circuit. By following a logical diagnostic path—checking actual motor temperature, inspecting wiring, verifying parameters, and analyzing historical data—most instances can be resolved in under 30 minutes.
: If the motor fails to stop after an OFF command before being turned back ON, activate the "Flying Restart" function (
Siemens drive fault code F07902 is a protective feature designed to shield your equipment from catastrophic failure. While a sudden stall often points to an obvious mechanical jam, chronic or intermittent F07902 faults are usually cured by fine-tuning torque limits, adjusting the stall delay timer (p2177), or ensuring that the drive's internal motor model accurately matches the physical asset on the plant floor.
When Fault 7902 appears, follow this structured approach: siemens drive fault code 7902
The most common cause is a physical obstruction or an actual mechanical stall in the driven equipment.
This diagnostic guide breaks down exactly what Fault 7902 means, why it happens, and how to methodically troubleshoot your system to restore normal operations safely. Understanding Siemens Fault Code 7902
In the drive parameters (using STARTER or Startdrive):
Follow this systematic approach. Always lock out and tag out power before touching terminals. Check all power cable terminations at both the
Siemens drives do not rely solely on external sensors. They use internal at the inverter’s output stage. When the motor is running, the drive expects balanced currents. If one phase deviates by more than a programmable tolerance (typically set via parameter p3230 in Sinamics), the drive triggers fault 7902.
Understanding the root causes of this fault and knowing how to systematically troubleshoot it can minimize costly production downtime. What is Siemens Fault Code F07902?
If you have a dynamic load, try increasing the or decreasing the Integral Time (p1472) to make the speed controller more responsive. Step 5: Check Encoder/Sensorless Settings
Manually rotate the motor shaft or load (if safe and feasible) to check for binding, friction, or total lockups. : If the motor fails to stop after
Once the drive registers that the motor has stalled, it does not shut down immediately. It waits for the duration defined in (Motor Stalled Delay). If the condition persists for that entire period, the drive outputs Fault 7902 and trips.
This article provides a comprehensive guide to understanding, diagnosing, and resolving Siemens fault code 7902. What Does Fault 7902 Mean?
the fault occurs (e.g., instantly at startup, during acceleration, or randomly during runtime)
: Rerun the motor data identification at standstill by setting